Hollow TiO2 microspheres with embedded nanoparticles were fabricated by a single-step process. Monodisperse oil drops containing TiO2 precursor and nanoparticles were injected into an aqueous phase by a microfluidic device. Controlled interfacial reaction of titanium alkoxides consolidates nanoparticles at the interfaces of oil-in-water emulsion drops, resulting in multifunctional inorganic shells.
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Eun et al. (2009) studied this question.
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